Ypu can do that. Or try to add the one with the Ip first, if it does not work, change it to the hostname. Dont forget to reload mysql or flush priveliges after you changed a user.

Since this user need have full access on db.server.com, i would set to use the ispconfig login instead make a new one?

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That depends on your setup. If the db server is not the amster server, then you can reuse it. If the master server is not the db server, then create a new user as the one created for the ispconfig setup allows only access from a slave to the master and not from one slave to another.

No luck too, my question now would be, there an way to specific the detail for log on apache?
My guess for there no info on apache logs would be because something would have be set for minimun details.

The phpmyadmin package is instaled from the linux distribution that you use on your server, its not from ispconfig. So if you search for a patch for this issue you will have to look for a patch for your linux distribution and not a patch for ispconfig as every linux distribution uses a different version of phpmyadmin. The linux distributions have bug tracking systems, so its a good idea to look there for a patch. You can also try if the patched file from plesk works on your server, just ensure that you backup the original file first.